Source Word
oxygen catastrophe
Noun
An
event
during
the
oxygenation
event
of
Earth's
past,
where
the
level
of
free
oxygen
in
the
environment
exceeds
the
toleration
levels
of
most
extant
anerobic
life,
becoming
toxic
to
existing
life,
which
prior
to
the
mass
production
of
oxygen,
was
an
anerobic
reducing
environment.
This
is
sometimes
considered
a
mass
extinction
event,
or
the
first
mass
extinction
event,
but
as
all
life
was
unicellular,
there
is
no
fossil
boundary
to
mark
the
event
for
conventional
paleontology
to
recognize
it.
Japanese Meaning
地球の酸素化の過程において、環境中の自由酸素濃度が上昇し、従来の嫌気性生物が耐えられないほどの毒性を持つ酸素が存在するようになり、その結果、多くの嫌気性生物が大量絶滅した現象。これは初期の大量絶滅事象として扱われることがあり、かつての還元的で酸素不足の環境からの急激な変化を示す。
Sense（1）
An
event
during
the
oxygenation
event
of
Earth's
past,
where
the
level
of
free
oxygen
in
the
environment
exceeds
the
toleration
levels
of
most
extant
anerobic
life,
becoming
toxic
to
existing
life,
which
prior
to
the
mass
production
of
oxygen,
was
an
anerobic
reducing
environment.
This
is
sometimes
considered
a
mass
extinction
event,
or
the
first
mass
extinction
event,
but
as
all
life
was
unicellular,
there
is
no
fossil
boundary
to
mark
the
event
for
conventional
paleontology
to
recognize
it.
Sense（2）
（ plural ）
